add -H to SYNOPSIS man-history

Signed-off-by: Sally O'Malley <somalley@redhat.com>

man/docker-history.1.md

@@ -7,6 +7,7 @@ docker-history - Show the history of an image
 # SYNOPSIS
 **docker history**
 [**--help**]
+[**-H**|**--human**[=*true*]]
 [**--no-trunc**[=*false*]]
 [**-q**|**--quiet**[=*false*]]
 IMAGE
@@ -19,7 +20,7 @@ Show the history of when and how an image was created.
 **--help**
   Print usage statement
 
-**-H**. **--human**=*true*|*false*
+**-H**, **--human**=*true*|*false*
     Print sizes and dates in human readable format. The default is *true*.
 
 **--no-trunc**=*true*|*false*